Which of the following shows that the earth behaves as a magnet ?

Foundation

Physics Foundation

Magnetism

Question

Existence of null points in the magnetic field of a bar magnet.

Non-existence of monopoles.

Repulsion between like poles.

Attraction between unlike poles.

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At null point resultant field is zero. One field is due to magnet, second field must be due to earth in equal amount and in opposite direction.